b12 injection in leg How to Give Injections at Home to Yourself · PA Relief Where to Inject Vitamin B12
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An average weight loss of -8.1 kg and -10.2 kg was attained at the end of 56 weeks with phentermine 75 mg plus topiramate 460 mg, and phentermine 150 mg plus topiramate 920 mg, respectively

Cyano B12 in particular should be avoided, especially in patients with pernicious anemia and/or with high homocysteine
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In StatPearls [Internet]

Vitamin injections are generally considered safe and well-tolerated
